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19 June, 01:39

Arlene us showing her work in simplifying (-7.9) + 8.2-3.4+2.1 identify any error in her work or in her reasoning.

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  1. 19 June, 04:14
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    Keep doing each step manually, and see where it slips up: - 7.9+8.2-3.4+2.1=-1 - 7.9+8.2 + (-3.4) + 2.1=-1 - 7.9 + (-3.4) + 8.2+2.1=-1 (-7.9 + (-3.4)) + (8.2+2.1) = - 1 - 11.3+10.3=-1
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